标题： 用氚源和大TPC探测器研究中微子特性 显示英文标题

标题： Neutrino Properties Studied with a Triton Source Using Large TPC Detectors

摘要： 本文的目的是研究在氚核衰变中发出的低能中微子中可能出现的中微子特性，最大中微子能量为18.6 KeV。 为此面临的技术挑战可以概括为构建一个能够检测低能反冲（低至几百eV）的非常大的TPC，并且满足所需的低背景限制。 更具体地说，我们建议开发一个半径约为10米的球形气态TPC，并在曲率中心放置一个200 Mcurie的氚源。 可以列出一些利用大体积TPC和低能反中微子进行的基本物理问题研究：1）涉及电子中微子消失实验中小混合角的振荡长度与探测器长度相当。 测量中微子-电子弹性散射的计数率将提供一种不受系统误差影响的振荡参数精确测量。 初步估计表明，对上述角度的测量灵敏度可达几个百分比。 2）低能探测阈值为中微子磁矩提供了独特的敏感性，其灵敏度比当前实验极限高两个数量级。 3） 在如此低的中微子能量下从未进行过散射研究，任何与预期行为的偏离都可能暗示超出标准模型的新物理现象。 我们呈现了理论计算的结果和可能测量的研究结果。 显示英文摘要

摘要： The purpose of the present paper is to study the neutrino properties as they may appear in the low energy neutrinos emitted in triton decay, with maximum neutrino energy of 18.6 KeV. The technical challenges to this end can be summarized as building a very large TPC capable of detecting low energy recoils, down to a few 100 eV, within the required low background constraints. More specifically We propose the development of a spherical gaseous TPC of about 10-m in radius and a 200 Mcurie triton source in the center of curvature. One can list a number of exciting studies, concerning fundamental physics issues, that could be made using a large volume TPC and low energy antineutrinos:1) The oscillation length involving the small mixing angle in the electronic neutrino disappearancei experiment is comparable to the length of the detector. Measuring the counting rate of neutrino-electron elastic scattering will give a precise measurement of the oscillation parameters free of systematic errors. First estimations show that a sensitivity of a few percent for the measurement of the above angle. 2) The low energy detection threshold offers a unique sensitivity for the neutrino magnetic moment which is about two orders of magnitude beyond the current experimental limit. 3) Scattering at such low neutrino energies has never been studied and any departure from the expected behavior may be an indication of new physics beyond the standard model. We present results of theoretical calculation and studies of possible measurements.